Teledyne Photo Scanner 703E Manuale Utente

The critical flow orifice is housed in the flow control assembly (Teledyne Instruments part number: 001760400) 
located on the top of the optical bench.  A sintered filter protects the jewel orifice so it is unusual for the orifice to 
need replacing, but if it does, or the filter needs replacement please use the following procedure (see the Spare 
Parts list in Appendix B for part numbers and kits): 

1.  Turn off power to the calibrator. 

2.  Locate the assembly to be repaired, see Figure, 3–3. 

3.  Disconnect the pneumatic connection from the flow assembly. 

4.  Remove the fitting and the components as shown in the exploded view in Figure 11.6.   

5.  Replace the o-rings (p/n OR000001) and the sintered filter (p/n FL000001). 

6.  If replacing the critical flow orifice itself (P/N 000941000), make sure that the side with the colored 

window (usually red) is facing downstream to the gas flow. 

7.  Apply new Teflon

®

 tape to the male connector threads 

8.  Re-assemble in reverse order.